How would I control how fast this script makes the enemy move?

So I'm trying to make enemies with different speeds, and I was wondering how I could adjust this script to have a variable or a number that controls how fast the enemy moves. I've tried changing the humanoid.WalkSpeed, multiplying a few things by the humanoid walkSpeed, but nothing seems to be working, any help?

Script:

function findNearestTorso(pos)
    local list = game.Workspace:children()
    local torso = nil
    local dist = 45
    local temp = nil
    local human = nil
    local temp2 = nil
    for x = 1, #list do
        temp2 = list[x] 
        if (temp2.className == "Model") and (temp2 ~= script.Parent) then
            temp = temp2:findFirstChild("HumanoidRootPart")
            human = temp2:findFirstChild("Humanoid")
            if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
                if (temp.Position - pos).magnitude < dist then
                    torso = temp
                    dist = (temp.Position - pos).magnitude
                end
            end
        end
    end
    return torso
end




while wait() do
    wait(1)
    local target = findNearestTorso(script.Parent.HumanoidRootPart.Position)
    if target ~= nil and target.Parent:FindFirstChild("UpperTorso") then
        script.Parent.Humanoid:MoveTo(target.Position, target)
    end

end